I have a Toshiba 36A50 TV that is about 6-7 years old. The picture only has a bright 1/4" line with color and sound. The back ground is black. About 2 months ago I removed the back off and carefully used a air nozzle to blow off the heavy dust. The TV worked great until a couple of days ago. I tried unpluging for 15 minutes no change. What part could be needding replacing. I have a Toshiba 36A50 TV that is about 6-7 years old. The picture only has a bright 1/4" line with color and sound. The back ground is black. About 2 months ago I removed the back off and carefully used a air nozzle to blow off the heavy dust. The TV worked great until a couple of days ago. I tried unpluging for 15 minutes no change. What part could be needding replacing.

AnonymousOct 25, 2008

I have the same issue. I can pull the TV out , but it will be extremley difficult seeing as though the TV is large and heavy. Before I do this do anyone have any other suggestins on what this might be before I open this up?I have the same issue. I can pull the TV out , but it will be extremley difficult seeing as though the TV is large and heavy. Before I do this do anyone have any other suggestins on what this might be before I open this up?

3 Answers

My Toshiba 36A50 had the same issue.The picture would gradually shrink until it no longer appeared and there was only a thin line running from left-to-right across the center of the screen.The volume still worked perfect.

From information I gleaned from this site and others, I removed the main circuit board and flipped it over to re-solder the pins going to the Vertical IC (TA8427K).This IC is right about center of the board mounted on an aluminum heatsink so it is soldered in vertically.You can easily see the part number on the IC and it is the only one of that part number.Additionally, the silk-screen on the PC board has a QC301 next to it identifying the part.

After I re-soldered it, the TV works excellent.I just did this yesterday afternoon 10.26.08.

Thinks to note that have been pointed out by others:

There is high voltage in the TV even after the power is removed.There are several sites where they tell you how to remove the power.

Make a note of all connections.Most of the connectors are keyed to go in only one way but some you can turn the connector either way.Write down all the information and take some digital pictures before you disconnect everything.

As was pointed out but other people, the Vertical IC and/or some of the surrounding capacitors may be defective and need replacement.Its possible that your local Radio Shack may have what you need but I would not count on it.A possible source for parts is www.digikey.com.

Dear friend for what you are saying you have some loose connection on the main board,you need to get a bright light a soldering iron and some solder wire and re-do the connection that look loose.
wish you luck

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I would look for a Vertical circuit failure. Most likely is the vertical output IC and or open resistor off the hv transformer. Definitely look for any loose solder connections around the Vertical output IC.
Hope this helps,
Skyassoc

This problem is caused by the loss of vertical deflection. Either the vertical output section of your TV or the vertical coupling capacitor has completely failed. In any event you will have to have a TV technician fix this set, BTW I hope you have not been playing the TV with the line on the screen this will burn the TV screen.

The vertical output IC has stopped working. The vertical output IC is the part that drives the coils in the yoke that spreads the picture up and down. This could be because it has cracked loose from the board (solder joints) or it simply burned out. Sometimes a bad pump-up cap will cause the vertical output IC to short out, and when the IC shorts out it often opens up a small value resistor next to the flyback. This is a relatively easy thing to repair. A qualified tech will be able to tell exactly why the vertical output has stopped working and repair it for you.

this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!

sounds like you have a vertical sweep problem. Where the fault lies cpuld be the vertical output IC the verticle b+ feed, could be the capacitors in the vertical circuit?? Your gonna need to troubleshoot thr vrtical circuit if your not a tech thin my advise is to take the set to a pro for sn est. Good Luck